Error regarding Input port when using SIMULINK

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Sameema Tariq 2020-8-24

I have system which shows error in this way.

Error in port widths or dimensions. Output port 1 of 'SMC1/LQR_Controller/u' is a one dimensional vector with 3 elements.

Error in port widths or dimensions. Input port 1 of 'SMC1/LQR_Controller/MatrixB' is a one dimensional vector with 1 elements.

Although the MatrixB is receiving the same input as u 's output. Kindly guide me how do I resolve this error.

The image of system is given below:

Simulink

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